1212000000 has 252 divisors, whose sum is σ = 4071979128. Its totient is φ = 320000000.

The previous prime is 1211999993. The next prime is 1212000011. The reversal of 1212000000 is 2121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (6).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 11999950 + ... + 12000050.

Almost surely, 2^1212000000 is an apocalyptic number.

1212000000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1212000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2035989564).

1212000000 is an abundant number, since it is smaller than the sum of its proper divisors (2859979128).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1212000000 is an frugal number, since it uses more digits than its factorization.

1212000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150 (or 111 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 6.

The square root of 1212000000 is about 34813.7903710584. The cubic root of 1212000000 is about 1066.1890222579.

Adding to 1212000000 its reverse (2121), we get a palindrome (1212002121).

It can be divided in two parts, 12 and 12000000, that multiplied together give a square (144000000 = 12000²).

The spelling of 1212000000 in words is "one billion, two hundred twelve million", and thus it is an aban number.